Which ancient civilization first implemented dedicated shop streets with standardized storefronts featuring open-front designs to display products to passersby, a retail innovation still used in modern shopping districts?

The ancient world was filled with remarkable commercial innovations that shaped retail as we know it today. From the bustling markets of Mesopotamia to the complex trading networks of Rome, ancient civilizations pioneered retail concepts that would echo through millennia. This trivia question focuses on a groundbreaking retail innovation from ancient times that revolutionized how merchants displayed and sold their products to consumers.

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Ancient Rome with its 'tabernae' system along major thoroughfares
Ancient Egypt with its 'per-nebu' marketplaces near temple complexes
Ancient Greece with its 'stoa' colonnaded marketplaces in city centers
Ancient Mesopotamia with its 'karum' merchant quarters in major cities